CN110620484A

CN110620484A - Double-air-gap motor

Info

Publication number: CN110620484A
Application number: CN201810637565.9A
Authority: CN
Inventors: 李伟
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-06-20
Filing date: 2018-06-20
Publication date: 2019-12-27

Abstract

The invention relates to a double-air-gap motor. The double-air-gap motor comprises a shell, a stator and a rotor, wherein the stator and the rotor are installed in the shell, the stator comprises a first stator and a second stator, the rotor is located between the first stator and the second stator, so that double air gaps are formed between the rotor and the first stator and between the rotor and the second stator, the first stator and the second stator respectively comprise a stator core and a stator winding, the rotor comprises a rotor core and a rotor winding, the number of turns of each phase of winding of the second stator winding and the first stator winding is the same, the phase is the same, the pitch is the same, and the directions of magnetic axes generated on a rotor magnetic loop by the second stator winding and the first stator winding are the same. The double air gap motor of the invention adopts a double air gap structure and the current directions of the rotor conductors in a pair of magnetic fields are the same. The magnetic fields generated by the current conductors in a pair of magnetic fields may act simultaneously on a pair of magnetic poles. Compared with the existing motor, the double-air gap motor has higher efficiency and power and saves more energy under the condition of the same volume and electrical parameters.

Description

Double-air-gap motor

Technical Field

The invention relates to a double-air-gap motor.

Background

With the rapid development of economy, power equipment has become an essential material basis in human life. The electric motor is a common power device, generally composed of a rotor and a stator, and is used for driving the rotor to work by using an electromagnetic field and outputting power through an output shaft. The operation principle of a motor with a single-sided air gap is shown in fig. 1, and magnetic pole magnetic flux is from an N pole → an air gap → a rotor core tooth space → a rotor core yoke → a rotor core tooth space → an air gap → an S pole → a magnetic pole yoke → an N pole. The current direction of the rotor conductor loop in each pair of N, S pole magnetic field loops is two (one positive and one negative), which results in that the conductor in one current direction can only act on a single magnetic pole, but not on a pair of magnetic poles at the same time, and the motor with the single-side air gap arrangement can not effectively exert all magnetic energy of the rotor conductor. And the double-air-gap motor rotor winding and the single-air-gap motor rotor winding have the same parameters, and under the condition of the same frequency voltage and current, the electromotive force generated by the double-air-gap motor rotor winding is the same as that of the single-air-gap motor rotor winding, so that the output power of the double-air-gap motor is larger than that of the single-air-gap motor under the condition of the same electric power.

Disclosure of Invention

The invention aims to provide a double-air-gap motor, which aims to solve the problem of high power consumption of the existing single-air-gap motor due to the existence of a magnetic yoke magnetic flux loop.

In order to achieve the purpose, the technical scheme of the double-air-gap motor is as follows:

the utility model provides a double air gap motor includes the casing and installs stator, rotor in the casing, the stator includes first stator and second stator, and the rotor is located between first, the second stator thereby makes and forms double air gaps between rotor and first, the second stator, first stator and second stator all include stator core and stator winding, and the rotor includes rotor core and rotor winding, and the number of turns of second stator winding and every phase winding of first stator winding is the same, the phase place is the same, the pitch is the same, and the direction of the magnetic axis that the winding of second stator and first stator produced on rotor magnetic circuit is unanimous.

The invention has the beneficial effects that: referring to fig. 2, the operating principle of the double air gap motor of the present invention is: the two sides of the rotor core form a double air gap loop (the magnetic flux is from N pole → air gap → S pole → magnetic pole yoke → N pole → air gap → rotor core → air gap → S pole → magnetic pole yoke → N pole), and the rotor core is free of the magnetic yoke magnetic flux loop, the directions of all conductor currents in a pair of magnetic pole magnetic fields are the same, and the magnetic field generated by the conductor currents can simultaneously act on the pair of magnetic poles. Compared with the existing motor, the double-air gap motor has higher efficiency and power and saves more energy under the condition of the same volume and electrical parameters.

Further defining the specific structure of the rotor core, the rotor core may have two forms, a first form: the rotor core is of a double-sided tooth-shaped structure, tooth grooves are formed in the inner circle, the outer circle or the end faces of the two sides of the rotor core, and the rotor winding is embedded in the tooth grooves in the inner circle, the outer circle or the two sides respectively. The rotor core is of a double-tooth structure, and the windings are arranged on the double teeth of the rotor core, so that the efficiency of the motor is improved.

Further, the rotor winding is a multi-phase distributed winding. The motor efficiency is improved.

Furthermore, the rotor core silicon steel sheet is fixed on the supporting disc by at least more than three positioning shafts, and the insulating sleeve made of engineering plastics is fixed between the rotor core and the positioning shafts.

The second form is: the rotor iron core is of a single-tooth structure, and the rotor winding is wound on the tooth socket. The rotor iron core is single-tooth and is convenient to process.

Further, the rotor winding is a concentrated winding. The centralized winding has simple structure and low processing cost.

Various improvements can be made to the various technical solutions:

the first improvement is that: the first stator, the second stator and the rotor are coaxially arranged, and the rotor is located between the second stator and the first stator in the radial direction of the shell.

Two fixing forms can be adopted for the first stator, the second stator and the rotor, wherein one fixing form is as follows: the shell is internally provided with a fixed shaft, the second stator is fixed on the fixed shaft, two ends of the rotor are rotatably assembled with the fixed shaft through a supporting piece, and one end of the supporting piece extends out of the shell to form an output shaft. The fixed shaft arranged in the shell is beneficial to enhancing the fixing strength of the stator.

The other is as follows: an output shaft is rotatably assembled in the shell, the rotor is fixedly connected to the output shaft, and the second stator and the first stator are fixed in the shell. This configuration helps to make the internal structure of the housing more compact.

When the second fixed form is used, the leads of the rotor polyphase winding are connected to the incoming power line via slip rings.

When the rotor core is in a single-tooth structure, the silicon steel sheets overlapped into the rotor core are formed by splicing at least four I-shaped silicon steel sheets, and the grooves of two adjacent I-shaped silicon steel sheets are butted to form a tooth socket. The rotor winding is arranged in a tooth groove formed by splicing a plurality of I-shaped silicon steel sheets, and the fixing strength of the rotor winding is enhanced.

The second improvement is as follows: the double-air-gap motor is an asynchronous motor, the second stator and the first stator are respectively and fixedly installed in the shell, and the second stator winding and the first stator winding are connected in parallel or in series with the same phase.

The structural forms of the rotor winding and the stator winding can be two, wherein one of the structural forms is as follows: the rotor winding is a squirrel-cage winding, and the second stator winding and the first stator winding are both multiphase distributed windings.

The other is as follows: the rotor winding is a multiphase distributed winding, and the second stator winding and the first stator winding are both squirrel-cage windings.

The third improvement is that: the shell is internally and rotatably provided with an output shaft, the first stator, the second stator and the rotor are of an axial disc type structure, the first stator, the second stator and the rotor are coaxially arranged, the rotor is positioned between the first stator and the second stator in the axial direction of the shell, the first stator and the second stator are fixedly connected with the shell, and the rotor is fixedly connected with the output shaft.

The arrangement form of the first stator, the second stator and the rotor is further limited, the first stator and the second stator are arranged in groups and are in multiple groups, and one rotor is arranged between two adjacent groups.

When the first stator and the second stator are in a plurality of groups, the first stator and the second stator are fixed on the shell through the T-shaped support ring.

Drawings

FIG. 1 is a schematic diagram of the operation of a prior art single air gap motor;

FIG. 2 is a schematic diagram of the operation of the dual air gap motor of the present invention;

FIG. 3 is a schematic structural diagram of a first embodiment of a dual air gap motor according to the present invention;

FIG. 4 is a schematic structural diagram of the stator and rotor of FIG. 3;

FIG. 5 is a state diagram of FIG. 2 with the rotor fixed;

FIG. 6 is a schematic structural diagram of a second embodiment of the dual air gap motor of the present invention;

FIG. 7 is a schematic structural diagram of a third embodiment of the dual air gap motor of the present invention;

FIG. 8 is a sectional view taken along line A-A of FIG. 7;

FIG. 9 is a schematic structural diagram of a fourth embodiment of the dual air gap motor of the present invention;

FIG. 10 is a schematic structural diagram of a fifth embodiment of the dual air gap motor of the present invention;

FIG. 11 is a partial cross-sectional view of FIG. 10;

FIG. 12 is a partial cross-sectional view of FIG. 10;

FIG. 13 is a schematic structural view of a sixth embodiment of a dual air gap motor of the present invention;

fig. 14 is a schematic structural view of a seventh embodiment of the double air gap motor of the present invention;

FIG. 15 is a sectional view taken along line B-B of FIG. 14;

FIG. 16 is a first schematic structural diagram of an eighth embodiment of the dual air gap motor of the present invention;

fig. 17 is a second schematic structural view of an eighth embodiment of the double air gap motor of the present invention.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings.

As shown in fig. 3, 4 and 5, the first embodiment of the dual air gap motor of the present invention includes a housing, a first stator 102 and a second stator 102a are installed in the housing, and a rotor 101 is disposed between the first stator 102 and the second stator 102 a. The first stator and the second stator are arranged coaxially with the rotor, and the rotor is located between the first stator and the second stator in the radial direction of the shell. The rotor 101 is formed by overlapping annular silicon steel sheets with teeth on the inner circle and the outer circle, the shape of a tooth socket of the rotor is completely the same as that of the tooth socket of the existing motor rotor, the tooth sockets on the inner circle and the outer circle of the rotor 101 are uniformly distributed and correspond to the inner teeth and the outer teeth, the radial width of the silicon steel sheets at the groove root part 101a is more than four millimeters, the rotor 101 is uniformly distributed with more than or equal to three positioning holes 106a along a middle parting line between the inner circle and the outer circle, and the aperture of the positioning. Rotor windings 103 are respectively embedded in the inner wire slot and the outer wire slot of the rotor 101, the rotor windings 103 are multi-phase distributed windings, and the magnetic axis directions of the windings of each phase on the inner circle and the outer circle of the rotor 101 are radially arranged and have the same direction, the same pitch, the same number of turns and the same phase. Each phase of windings on two sides of the rotor 101 are connected in series or two sets of multi-phase windings are connected in parallel, the distribution form of the rotor winding 103 is completely the same as that of the existing motor winding, and the rotor winding of the embodiment is a three-phase winding and is connected into a three-phase power supply through a slip ring 115. The rotor 101 is fastened between the front and rear rotor supporting disks 105, 105a by a positioning shaft 106 in a positioning hole 106 a. More than two sections of tightly-matched insulating sleeves 107 are arranged between the positioning shaft 106 and the positioning hole 106a, the insulating sleeves 107 are made of engineering plastics or oxidized metal, the positioning shaft 106 is made of alloy structural steel, one end of the positioning shaft 106 is fixed on the rotor supporting disk 105, the other end of the positioning shaft 106 is provided with a screw thread, the fan 111, the rotor supporting disk 105a and the rotor 101 are fastened on the rotor supporting disk 105 through a nut 110, a flat gasket 109 and an insulating gasket 108, the rotor supporting disks 105 and 105a are made of disk-shaped metal materials, the positioning hole corresponding to the rotor 101 is formed in the end face of the disks, two sets of bearings 119 on the rotor supporting disks 105 and 105a are supported on a fixed shaft 116, the fixed shaft 116 is made of metal materials and is fixed on an inner hole of an end cover 112a, the rotor supporting disk 105 and the rotor shaft 105b are of an. The two sides of the inner circle and the outer circle of the rotor 101 are respectively provided with a second stator 102a and a first stator 102, an air gap with a certain length dimension is arranged between the first stator 102, the second stator 102a and the rotor 101, the first stator 102 and the second stator 102a are formed by overlapping silicon steel sheets, the form and the structure of the first stator 102 and the second stator 102a are completely the same as those of the existing synchronous motor, the embodiment adopts the existing non-salient electromagnetic magnetic pole structure of the synchronous motor, the turns of the first stator winding 104 and the second stator winding 104a on the first stator 102 and the second stator 102a are the same, the direction of the excitation magnetic axis is the same, the directions of the magnetic fields generated by the magnetic pole windings on the two sides of the rotor 101 in series connection are the same, the axes of the inner magnetic pole and the outer magnetic pole are overlapped, the lead of the second stator winding 104a fixed on the fixed shaft 116 by a positioning device is led, the fixed shaft 116 is made of carbon steel and is fixed in the inner hole of the end cover 112a by a positioning key 117 and a positioning screw. The end covers 112 and 112a are provided with air ports 130, and form a fixed body with the casing 113 through a positioning and fastening device, the end cover 112 is provided with a bearing 120 for supporting the rotor shaft 105b, and the rotor shaft 105b is an output shaft.

The double-air-gap motor in the embodiment has two operation modes, wherein the operation mode is as follows: the external separately excited rectifying excitation device of the double-air-gap motor generates rated excitation magnetic flux in the air gap of the stator and the rotor with rated direct current to the excitation winding of the motor, an external three-phase power supply supplies three-phase power to the rotor winding through a slip ring, the rotor rotates in a double-air-gap magnetic field formed by the first stator magnetic pole and the second stator magnetic pole, and mechanical power is output outwards through the axial direction of the rotor.

The second operation mode is as follows: and a third harmonic excitation winding is additionally arranged in the rotor tooth slot to form a self-excitation system and is connected with the stator winding through an excitation slip ring, and the other operation modes are the same as the first operation mode.

In the second embodiment of the double air gap motor of the present invention, as shown in fig. 6, the structures of the rotor 101, the rotor winding 103, the rotor supporting disk 105, the positioning shaft 106, the insulating sleeve 107, the insulating pad 108, and the flat pad 109 in this embodiment are the same as those in the first embodiment. The difference from the first embodiment is that 110a in this embodiment is a rivet joint, the rotor supporting disk 105 is fixed on the motor rotating shaft 122 in an L-shaped sleeve-shaped structure, and the lead wires of the rotor winding 103 are connected to the slip ring 115 through the central hole on the rotating shaft 122. The end cap 112 is a hollow cup-shaped structure, the first and second stators 102, 102a are made of silicon steel sheets with large and small teeth, the structure of the end cap is the same as that of the first and second stators of the first embodiment, and the first and second stators 102, 102a are respectively fixed on the outer circle of the cup sleeve on the end cap 112 and the inner circle of the casing 113, the first and second stators 102, 102a can also be made of permanent magnet materials, the position relationship between the first and second stators 102, 102a and the rotor 101 is the same as that of the first embodiment, and the inner diameters of the end caps 112, 112a are provided with bearings 120 for supporting the rotating shaft 122.

The double-air-gap motor in the embodiment has two operation modes, wherein the operation mode is as follows: the fixed casing provides the rotor winding with the multi-phase electricity or provides the variable frequency and variable voltage power supply through the controller through the slip ring on the rotating shaft, and the rotor rotates to output mechanical power to the outside.

The second operation mode is as follows: the rotor shaft is fixed, the Hall element is additionally arranged on the rotor silicon steel sheet, a rotor winding lead and a Hall element lead are directly led out through the hollow shaft and connected to the controller, the direct-current power supply provides variable-frequency voltage for the rotor winding through the controller, and the machine shell rotates to output mechanical power to the outside.

As shown in fig. 7 and 8, the third embodiment of the double air gap motor of the present invention is different from the first embodiment in that the multiple layers of silicon steel sheets stacked to form the rotor core in the present embodiment are formed by splicing six i-shaped stators, and the grooves of two adjacent i-shaped silicon steel sheets are butted to form the tooth grooves. The rotor winding 103 is a concentrated winding which is respectively embedded in six single-tooth I-shaped iron core grooves, the concentrated winding on the rotor 101 can be connected into a multi-phase winding, two positioning holes 106a are arranged at two ends of the inner circle and the outer circle of the sector center line of each single-tooth iron core, each I-shaped sector stator and rotor 101 is axially fixed on a rotor supporting disk 105 through two positioning screws 106b and a pressing plate 102c, two annular convex ribs are arranged at the excircle of the end face of the rotor supporting disk 105, twelve positioning screw holes are formed in the convex ribs, an annular groove is formed between the convex ribs at the inner part and used for accommodating the rotor winding 103, and the positioning screws 106b, the rotor supporting disk 105 and the rotor 101 are a fixed body.

As shown in fig. 9, the dual air gap motor in this embodiment is an asynchronous motor, and the asynchronous motor has two structural forms, namely: the tooth grooves on the silicon steel sheets of the second stator 102a and the first stator 102 are arranged in a tooth shape uniformly distributed on the circumference (the shape is the same as that of the existing asynchronous motor stator), the wire slots of the second stator 102a and the first stator 102 are embedded with stator windings 104a and 104, the first stator winding 104 and the second stator winding 104a are multi-phase windings, the phase number is the same, the magnetic axis direction of each phase is the same, the two sets of windings of the first stator winding 104 and the second stator winding 104a are connected in parallel or the windings of each phase are connected in series, the iron core of the rotor 101 is the same as that of the first embodiment, the rotor windings 103 are embedded in the wire slots on the inner circle and the outer circle of the rotor 101 along. The remaining mechanical structures in this embodiment are the same as in the first embodiment and the second embodiment. The operation mode of the double air gap motor in the embodiment is as follows: the multiphase windings of the second stator 102a and the first stator 102 are inputted with multiphase ac voltages, and the multiphase windings of the second stator 102a and the first stator 102 form a double air gap rotating magnetic field that cuts the rotor cage winding, and the rotor winding rotates asynchronously under the action of electromagnetic force in the double air gaps. The second form: the difference from the first form is that the squirrel-cage winding is changed into a multi-phase winding, the multi-phase winding is changed into the squirrel-cage winding, and the operation mode of the rest structure is the same as that of the specific embodiment.

As shown in fig. 10, 11 and 12, a fifth embodiment of the dual air gap motor of the present invention is different from the first embodiment in that the stator cores 202 in the present embodiment have two disk-type axial structures, and the two stator cores 202 are arranged along the axial direction of the housing and fixed to the housing ribs 225 by the T-shaped outer support ring 223. The outer support ring 223 is made of a metal material, the outer support ring 223 and the chassis rib 225 are positioned through a positioning key 226, the two disc-type positioning iron cores 202 are made of silicon steel strips in a winding ring shape, tooth grooves are formed in end faces on two sides of the outer support ring, the form of the tooth grooves is the same as that of the tooth grooves of the existing disc-type motor, the axial width between the groove bottoms on the two sides of the two disc-type stator iron cores 202 is larger than five millimeters and is fixed in the inner diameter of the outer support ring 223 through a positioning screw 229 or a welding mode, the inner support ring 224 made of the metal material is fixed in the inner diameter of the disc-type stator iron cores 202 through the positioning screw 229 or the welding mode, multiphase distributed windings 204 are respectively embedded in the tooth grooves at two ends of the two disc-type stator iron cores 202, the magnetic axis directions of the multiphase windings 204 are axially arranged. Two sides of each stator core 202 are provided with disk rotor magnetic poles 201, the disk rotor magnetic poles 201 can be in a non-salient pole type or a salient pole type, and the disk rotor magnetic poles 201 have two specific manufacturing forms. The first form: the L-shaped and T-shaped disk rotor poles 201 are made of a unitary ferromagnetic metal material with splines on one or both end faces and are fixed to the shaft 222 by a retaining key 227. The second form: the disc rotor core magnetic pole 201 is made by winding silicon steel strips, a tooth groove is arranged on one end face or two end faces and is fixed in the inner and outer metal supporting sleeves through a welding part 228 or a positioning screw 229, and an inner hole of the supporting sleeve 224 is fixed on the rotating shaft 222 through a positioning key 227.

The tooth slots of the disk rotor magnetic poles 201 are respectively embedded with the excitation windings 203 and are led to the slip ring 215 through the central hole of the rotating shaft 222, the structural form and the connection mode of the excitation windings 203 are the same as those of the first embodiment, and the electromagnetic relation between each disk rotor magnetic pole 201 and the disk stator core 202 is also the same as that of the first embodiment. The fan 211 is fixed to the L-shaped rotor, the housing 213 is made of a metal material and fixed between two end covers 212 and 212a, both end covers 212 and 212a have an air opening 230 and a bearing 220 is installed in the inner diameter for supporting the rotation shaft.

The operation of the dual air gap motor of this embodiment is the same as that of the first embodiment.

Sixth embodiment of the double air gap electric motor according to the present invention, as shown in fig. 13, the double air gap electric motor in this embodiment is a single rotor disc type electric motor, a disc rotor magnetic pole 201 is fixed on a rotating shaft 222 through inner and outer support rings 224 and 223, a disc stator iron core 202 is fixed on a housing 213, and the disc stator magnetic pole is a permanent magnet type or an electromagnetic type. The rest is the same as the fifth embodiment, and the description is omitted.

A seventh embodiment of the double air gap motor of the present invention is, as shown in fig. 14 and 15, in this embodiment, the stator core 202 is an annular split i-shaped single-tooth core, the excitation winding 203 is embedded in the groove of the stator core 202, the excitation winding 203 is in the form of a concentrated winding, the stator core 202 is an arc silicon steel sheet which is radially overlapped and fixed on the outer U-shaped support ring 223b or the inner U-shaped support ring 224b through two fixing screws 206b and a pressing plate 202c, the U-shaped support ring 223b is made of a metal material and fixed on the casing 213 or the rotating shaft 222, and the rest of the structure and the electromagnetic relationship are the same as those of the fifth embodiment and the sixth embodiment.

In an eighth embodiment of the double air gap motor of the present invention, as shown in fig. 16 and 17, the double air gap motor in this embodiment is a disc-type asynchronous motor. The disc type asynchronous motor has two forms, one: the disk rotor magnetic pole 201 is made by winding silicon steel strips, the end surfaces of two sides of the magnetic pole are provided with uniformly distributed tooth grooves, the shape of the tooth grooves is the same as that of the tooth grooves of the existing disk motor, squirrel cage windings 203 are respectively embedded in the tooth grooves of two sides of an iron core of the disk rotor 201c, and the iron core of the rotor is fixed on a rotating shaft through an inner support sleeve and an outer support sleeve. The disc type stator core 202 is made by winding silicon steel sheets, and is provided with uniformly distributed tooth grooves on one side surface, the stator core 202 is arranged on two sides of the disc type rotor 201c, multiphase distributed windings 204 are respectively embedded in the tooth grooves of the stator core, and the stator core 202 is fixed on the inner circle of the machine shell through an inner support sleeve 224 and an outer support sleeve 224. The other structural forms are the same as those of the fifth embodiment. The second form: the disc rotor 201c in the first form is changed into a disc stator core 202 fixed on the inner circle of the machine shell, and multiphase distributed windings 204 are embedded in tooth slots on two sides of the disc stator core 202. The disc type stator core 202 in the first form is changed into a disc type rotor 201c fixed on a rotating shaft, a squirrel cage winding is embedded in a tooth groove on each side of the disc type rotor 201c, and the rest is the same as the first form.

The operation mode of the double air gap motor in this embodiment is the same as the operation direction of the fourth embodiment.

Claims

1. A dual air gap motor, characterized by: including the casing and install stator, the rotor in the casing, the stator includes first stator and second stator, and the rotor is located between first, the second stator and makes the rotor and first, form double air gaps between the second stator, first stator and second stator all include stator core and stator winding, and the rotor includes rotor core and rotor winding, and the number of turns of second stator winding and every phase winding of first stator winding is the same, the phase place is the same, the pitch is the same, and the direction of the magnetic axis that the winding of second stator and first stator produced on rotor magnetic circuit is unanimous.

2. The dual air gap motor of claim 1, wherein: the rotor core is of a double-sided tooth-shaped structure, tooth grooves are formed in the end faces of the inner circle, the outer circle or the two sides of the rotor core, and the rotor winding is embedded in the tooth grooves of the inner circle, the outer circle or the two sides of the rotor core respectively.

3. The dual air gap motor of claim 2, wherein: the rotor winding is a multiphase distributed winding.

4. The dual air gap motor of claim 2, wherein: the rotor core silicon steel sheet is fixed on the supporting disc by at least more than three positioning shafts, and the insulating sleeve made of engineering plastics is fixed between the rotor core and the positioning shafts.

5. The dual air gap motor of claim 1, wherein: the rotor iron core is of a single-tooth structure, and the rotor winding is wound on the tooth socket.

6. The dual air gap motor of claim 5, wherein: the rotor winding is a centralized winding.

7. The double air gap motor as claimed in claim 1 ~ 6, wherein the first stator, the second stator and the rotor are coaxially arranged with the rotor located between the second stator and the first stator in a radial direction of the housing.

8. The dual air gap motor of claim 7, wherein: the shell is internally provided with a fixed shaft, the second stator is fixed on the fixed shaft, two ends of the rotor are rotatably assembled with the fixed shaft through a supporting piece, and one end of the supporting piece extends out of the shell to form an output shaft.

9. The dual air gap motor of claim 7, wherein: an output shaft is rotatably assembled in the shell, the rotor is fixedly connected to the output shaft, and the second stator and the first stator are fixed in the shell.

10. The dual air gap motor of claim 9, wherein: the lead wires of the rotor multi-phase winding are connected with an input power line through slip rings.